Black, Dan A.; Joo, Joonhwi; LaLonde, Robert John; … - National Bureau of Economic Research - 2022
We provide simple tests for selection on unobserved variables in the Vytlacil-Imbens-Angrist framework for Local Average Treatment Effects (LATEs). Our setup allows researchers not only to test for selection on either or both of the treated and untreated outcomes, but also to assess the...